During all this years i'm working on B737 NG, leakage on the main and nose landing gear strut is common on all aircrafts that i've worked with either Mastar or on current fleet.

I'm sure if someone unfamiliar with this situation will thinked that the this landing gear is having a problem of leakage however it is not.

As per Boeing Maintenance Tip document, this is because of new design on new 737 landing gear, thin layer of oil presence everytime the shock strut extended and this layer plus dirts that have sticked to it has been push down by a scraper seal as the shock strut compressed.

A follow-up maintenance action have to be carry-out after few hundred hours of aircraft operation, this is to ensure sufficient amount of fluid remain in the shock strut itself.